TSAG Faraday crystal is an ideal magneto-optical crystal, which is mainly used in the wavelength range of 400-1600 nanometers, namely the visible and infrared bands. TSAG is an indispensable crystal for the next generation of high-power lasers due to its advantages of high constant, good thermal and mechanical properties. Compared with TGG, the Verdet constant at 1064 nm of TSAG is 20 % higher and the absorption is 30 % lower. Recently, the optical and scintillation properties of TSAG (Tb3Sc2Al3O12) crystal was investigated, and capabilities to be used as a scintillator screen was demonstrated.
|Transmittance Range(bulk/uncoated)||400-1600 nm|
|Crystal Structure||Cubic，Space group Ia3d|
|Lattice Parameter||a=12.3 Å|
|Extinction Ratio||＞30 dB|
|Diameter Tolerance||+0.00 mm/-0.05 mm|
|Length Tolerance||+0.2 mm/-0.2 mm|
|Chamfer||0.1 mm @ 45°|
|Flatness||＜λ/10 at 633 nm|
|AR coating||＜0.3% @ 1064 nm|
- Large Verdet constant（48 radT-1m-1 at 1064 nm），about 20% higher than that of TGG;
- Low absorption（＜3000 ppm/cm at 1064 nm），about 30% less than that of TGG;
- High power compliant;
- Low thermally-induced birefringence;
- Making the isolator small.
Lasers with high average output power find application in different fields of activity: medicine, industry, space. They are actively used in numerous scientific projects such as ultrabright sources of radiation construction (ELI), inertial confinement fusion facilities (NIF, HiPER, Genbu), gravitational wave detection (LIGO, Virgo, Einstein Telescope) etc. The average output power of continuous wave and repetitively pulsed lasers is steadily growing, making it increasingly important to reduce thermal effects arising in various optical elements due to radiation absorption. Faraday isolators are essential parts of such laser systems as they prevent unwanted feedback and ensure safe operation of system.TSAG (terbium scandium aluminum garnet) crystal is interesting medium with effective Faraday rotation. Its advantage over the TGG crystal is a ~20% higher Verdet constant (the precise value depends on the content of scandium) and over the TAG crystal is the possibility of growing large-aperture single crystals of good optical quality.
Optical and scintillation properties of TSAG (Tb3Sc2Al3O12) crystal was investigated, and capabilities to be used as a scintillator screen was demonstrated. In photoluminescence (PL) spectra, some emission lines due to Tb3+ 4f-4f transitions appeared from 500 to 700 nm. PL quantum yields of TGG and TSAG were 6.5 and 50.9%, respectively. When irradiated by X-rays, these crystals showed intense scintillation, and the emission wavelengths were the same as those in PL spectra. The scintillation decay times of TSAG was 678 μs, respectively.